EP2665314A1 - Procédé d'émission de signaux pour station de base et station de base à économie d'énergie - Google Patents

Procédé d'émission de signaux pour station de base et station de base à économie d'énergie Download PDF

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Publication number
EP2665314A1
EP2665314A1 EP13180617.6A EP13180617A EP2665314A1 EP 2665314 A1 EP2665314 A1 EP 2665314A1 EP 13180617 A EP13180617 A EP 13180617A EP 2665314 A1 EP2665314 A1 EP 2665314A1
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EP
European Patent Office
Prior art keywords
energy
saving
base station
saving flag
sending
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Granted
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EP13180617.6A
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German (de)
English (en)
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EP2665314B1 (fr
Inventor
Yinghua Huang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method for sending signals from a base station and an energy-saving base station.
  • the consumption of electric energy is a significant part of the operation expenditure of a base station of a mobile operator.
  • the operators expect to reduce the overall power of the base station to reduce electric energy consumption and save costs, which caters for the modem trend of environment protection.
  • RSs downlink Reference Symbols
  • LTE Long Term Evolution
  • RSs downlink Reference Symbols
  • the power of a single RS is generally unchanged, and the transmit power occupied by the RS is in proportion to the number of RSs.
  • the transmit power occupied by the RS is also in proportion to the number of antennas.
  • the LTE system supports many kinds of system bandwidths, the number of RSs is in proportion to the bandwidth of the cell, and greater system bandwidth of the cell involves more RSs to be sent.
  • the transmit power occupied by sending of downlink RFs accounts for a very large proportion of the total downlink transmit power of the cell when few users are activated in the cell, or the air interface load is small, or even no user is activated in the cell.
  • the number of RSs to be sent is reduced by changing the bandwidth of the cell, the cell needs to be reconstructed or all activated users are out of connection, and the dynamic change of the cell bandwidth makes it necessary to recalculate many parameters, which increases the complexity of User Equipment (UE) greatly.
  • UE User Equipment
  • Embodiments of the present invention provide a method for sending signals from a base station and an energy-saving base station. Therefore, when the cell load is light, the method changes the bandwidth of transmitting downlink RSs of a cell dynamically to reduce energy consumption of the base station without changing the cell bandwidth which is a critical parameter; and the method relieves impact on the service caused by power consumption reduction but adds no complexity to the UE.
  • an energy-saving flag is set when the base station intends to enter the energy-saving mode, and the energy-saving flag may be an RS energy-saving indication, a data transmission bandwidth indication, or an indication of reducing antennas for sending data; the energy-saving mode corresponding to the energy-saving flag is notified to the UE; and then signals are sent in the energy-saving mode after the energy-saving flag is set.
  • the base station can take multiple energy-saving measures under support of the UE.
  • the base station can change the bandwidth of transmitting downlink RSs of the cell dynamically to reduce the energy consumption of the base station without changing the cell bandwidth which is a critical parameter; and the base station relieves impact on the service caused by power consumption reduction but adds no complexity to the UE.
  • FIG. 1 is a flowchart of a method for sending signals from a base station provided in an embodiment of the present invention.
  • FIG. 2 shows functional units of an energy-saving base station provided in an embodiment of the present invention.
  • a method for sending signals from a base station includes the following steps:
  • Step 11 Set an energy-saving flag when intending to enter an energy-saving mode.
  • the base station may be triggered to enter/quit the energy-saving mode in many modes:
  • Mode 1 The network side (including the base station or other network elements such as a network management server or a network planning tool) judges whether to enter/quit the energy-saving mode according to the current cell load status.
  • Mode 2 A policy of entering/quitting the energy-saving mode is set according to the network running status. For example, the base station is set to enter the energy-saving mode in different time segments everyday (1:00 am to 6:00 am), and/or enter/quit the energy-saving mode according to holidays (the working area enters the energy-saving mode in holidays).
  • Mode 3 The base station is triggered to enter/quit the energy-saving mode according to statistics in a period.
  • the network side (including the base station or other network elements such as a network management server or a network planning tool) determines the policy and time of entering/quitting the energy-saving mode according to the statistics in a period so that the base station is triggered to enter/quit the energy-saving mode dynamically at the time specified by the statistics.
  • the energy-saving flag comes in many types, for example, RS energy-saving indication, data transmission bandwidth indication, or an indication of reducing antennas for sending data.
  • Step 12 Notify the energy-saving mode corresponding to the energy-saving flag to a UE.
  • the base station may use a system broadcast message or dedicated signaling (such as reconfiguration signaling) to notify the energy-saving mode corresponding to the energy-saving flag to the UE.
  • a system broadcast message or dedicated signaling such as reconfiguration signaling
  • Step 13 Send signals in the energy-saving mode applied after setting the energy-saving flag.
  • the base station employs the following energy-saving mode: using the whole downlink bandwidth dynamically to send data, and sending RSs only in the downlink bandwidth with data to be sent.
  • the step of using the whole downlink bandwidth dynamically to send data refers to: in the whole range of downlink bandwidth, adjusting the occupied bandwidth dynamically according to the amount of sent data, and using small bandwidth when the amount of sent data is small, or using greater bandwidth when the amount of sent data is greater.
  • the base station when the set energy-saving flag is a data transmission bandwidth indication, the base station employs the following energy-saving mode: using the bandwidth indicated by the data transmission bandwidth indication as the downlink data transmission bandwidth to send data, and sending RSs only in the bandwidth indicated by the data transmission bandwidth indication or only in the union set of the bandwidths indicated by the data transmission bandwidth indication.
  • the base station when the set energy-saving flag is an indication of reducing antennas for sending data, the base station employs the following energy-saving mode: sending data by using an antenna sending mode corresponding to a reduced number of antennas.
  • an energy-saving flag is set when the base station intends to enter the energy-saving mode, and the energy-saving mode corresponding to the energy-saving flag is notified to the UE; and then signals are sent in the energy-saving mode after the energy-saving flag is set.
  • the base station can take multiple energy-saving measures under support of the UE. For example, the base station sends RSs only in the downlink bandwidth with data to be sent, or sends RSs only in the bandwidth indicated by a data transmission bandwidth indication, or sends data by using an antenna sending mode corresponding to the reduced number of antennas.
  • the base station can change the bandwidth of transmitting downlink RSs of the cell dynamically to reduce the energy consumption of the base station without changing the cell bandwidth which is a critical parameter; and the base station relieves impact on the service caused by power consumption reduction but adds no complexity to the UE.
  • the modulation mode and the code rate used for sending downlink data are based on a Channel Quality Indication (CQI) fed back by the UE.
  • CQI Channel Quality Indication
  • CQI comes in the following two types:
  • PUCCH Physical Uplink Control Channel
  • the other is a nonperiodic CQI reported by a Physical Uplink Shared Channel (PUSCH), and the periodic CQI is reported in five modes: mode 1-2, mode 2-0, mode 2-2, mode 3-0, and mode 3-1.
  • PUSCH Physical Uplink Shared Channel
  • CQI comes in the following two types:
  • the other is subband CQI, namely, the granularity of CQI is 1 subband, and the size of the subband is defined below, with 1 Resource Block (RB) being composed of 12 consecutive subcarriers: Cell bandwidth (unit: RB) Nonperiodic CQI corresponding to mode 2-0 and mode 2-2 (unit: RB) Periodic CQI and nonperiodic CQI of other modes (unit: RB) 8-10 2 4 11-26 2 4 27-63 3 6 64-110 4 8
  • the base station prefers the subband corresponding to the nonperiodic CQI mode when sending RSs in the case that the set energy-saving flag is an RS energy-saving indication or data transmission bandwidth indication.
  • the set energy-saving flag is an RS energy-saving indication or data transmission bandwidth indication.
  • the subband corresponding to the nonperiodic CQI mode is preferred as granularity of adjusting the sending of RSs in order to ensure measurement accuracy.
  • the nonperiodic CQI of the PUSCH is applied first, and only the subband CQI in the bandwidth of sending RSs is applied after the nonperiodic CQI of the PUSCH is obtained, so as to ensure performance of data transmission.
  • the network side triggers the base station to enter/quit the energy-saving mode.
  • the network side may trigger the base station to enter/quit the energy-saving mode according to the current cell load status, or network running status, or statistics in a period. For more details, see the method embodiment of the present invention described above.
  • the base station When intending to enter the energy-saving mode, the base station sets an RS energy-saving indication in a system message, and broadcasts the energy-saving mode corresponding to the RS energy-saving indication to all UEs in the cell.
  • the base station uses the whole downlink bandwidth dynamically according to the amount of service data, and sends RSs only in the downlink bandwidth with data to be sent, so as to ensure data demodulation and channel quality measurement.
  • the downlink bandwidth used by the base station for sending RSs needs to include the minimum bandwidth required by the base station for neighboring cell measurement. That is, the base station needs to send the RSs in the minimum bandwidth required for neighboring cell measurement (in an LTE system, the minimum bandwidth is 72 subcarriers at the center of the cell).
  • the base station When intending to quit the energy-saving mode, the base station cancels the RS energy-saving indication in the system message, and broadcasts the cancellation of the RS energy-saving indication to all UEs in the cell.
  • the base station uses the whole downlink bandwidth dynamically according to the amount of service data, and sends RSs in the whole downlink bandwidth.
  • This embodiment differs from the first embodiment in that: when intending to enter the energy-saving mode, the base station uses a dedicated signaling such as reconfiguration signaling to set an RS energy-saving indication, and notifies the energy-saving mode corresponding to the RS energy-saving indication to all connected UEs in the cell; when intending to quit the energy-saving mode, the base station uses a dedicated signaling to cancel the RS energy-saving indication, and notifies the cancellation of the RS energy-saving indication to all connected UEs in the cell.
  • a dedicated signaling such as reconfiguration signaling to set an RS energy-saving indication
  • the base station uses a dedicated signaling to cancel the RS energy-saving indication, and notifies the cancellation of the RS energy-saving indication to all connected UEs in the cell.
  • the network side triggers the base station to enter/quit the energy-saving mode.
  • the network side may trigger the base station to enter/quit the energy-saving mode according to the current cell load status, or network running status, or statistics in a period. For more details, see the method embodiment of the present invention described above.
  • the base station When intending to enter the energy-saving mode, the base station sets a data transmission bandwidth indication in a system message, and broadcasts the energy-saving mode corresponding to the data transmission bandwidth indication to all UEs in the cell.
  • the data transmission bandwidth indication may be expressed in a bitmap mode or a coding mode.
  • the granularity of the bitmap mode may be 1 RB or N RBs.
  • N may be a constant stipulated by a protocol, or a variable. If N is a variable, N may be a value correlated with the cell bandwidth as stipulated in the protocol, or a value broadcast through the system message.
  • the coding mode may be a Resource Indication Value (RIV) expression mode in the prior art, or a typical compression coding mode (such as Huffman coding).
  • RIV Resource Indication Value
  • the base station uses only the bandwidth indicated by the data transmission bandwidth indication when transmitting downlink data, and sends RSs only in the downlink data transmission bandwidth which is broadcast, so as to ensure data demodulation and channel quality measurement.
  • the base station needs to send the RSs in the minimum bandwidth required for neighboring cell measurement (in an LTE system, the minimum bandwidth is 72 subcarriers at the center of the cell).
  • the base station cancels the data transmission bandwidth indication in the system message, and broadcasts the cancellation of the data transmission bandwidth indication to all UEs in the cell.
  • the base station uses the whole downlink bandwidth dynamically according to the amount of service data, and sends the RSs in the whole downlink bandwidth.
  • This embodiment differs from the third embodiment in that: when intending to enter the energy-saving mode, the base station uses a dedicated signaling to set a data transmission bandwidth indication, and configures downlink data transmission bandwidth for each connected UE in the cell, and the base station uses only the bandwidth indicated by the data transmission bandwidth indication when transmitting downlink data, and sends RSs only in the union set of downlink transmission bandwidths configured for all UEs; when intending to quit the energy-saving mode, the base station uses a dedicated signaling to notify all connected UEs in the cell that the base station will use the whole downlink bandwidth dynamically, and sends RSs in the whole downlink bandwidth.
  • the network side triggers the base station to enter/quit the energy-saving mode.
  • the network side may trigger the base station to enter/quit the energy-saving mode according to the current cell load status, or network running status, or statistics in a period. For more details, see the method embodiment of the present invention described above.
  • the base station When intending to enter the energy-saving mode, the base station sets an indication of reducing antennas for sending data in a system message, and broadcasts this indication to all UEs in the cell.
  • the base station Upon change of the system message (change from the non-energy-saving mode to the energy-saving mode), the base station sends data by using the antenna sending mode corresponding to the reduced number of antennas. If the reduced number of antennas is 1, the corresponding antenna sending mode is a single-antenna mode; if the reduced number of antennas is greater than 1, the corresponding antenna sending mode is a transmit diversity mode.
  • all connected UEs Upon change of the system message, all connected UEs change the antenna sending mode to the corresponding antenna mode synchronously in line with the base station, namely, to the single-antenna mode or transmit diversity mode.
  • the base station sends data by using the antenna sending mode corresponding to the reduced number of antennas.
  • the base station cancels the indication of reducing antennas for sending data in the system message, and broadcasts the cancellation of the indication to all UEs in the cell.
  • the base station Upon change of the system message (change from the energy-saving mode to the non-energy-saving mode), the base station changes to send data through multiple antennas (such as 2 or 4 antennas), and all connected UEs change the antenna sending mode to the transmit diversity mode synchronously in line with the base station.
  • multiple antennas such as 2 or 4 antennas
  • the base station sends data by using the original antenna sending mode.
  • This embodiment differs from the fifth embodiment in that: when intending to enter the energy-saving mode, the base station sets an indication of reducing antennas for sending data in the system message, and then the base station needs to use a dedicated signaling to set the antenna sending mode corresponding to the reduced number of antennas for each connected UE. For example, if the base station changes from 4 antennas to a single antenna or changes from 2 antennas to a single antenna, the antenna sending mode is a single-antenna mode; when the base station changes from 4 antennas to 2 antennas, the antenna sending mode may be set to the transmit diversity mode or a spatial multiplexing mode. Afterward, the base station applies the antenna sending mode configured through the dedicated signaling to each connected UE in the cell respectively to send data.
  • the base station When intending to quit the energy-saving mode, the base station cancels the indication of reducing antennas for sending data in the system message, and then the base station still needs to use a dedicated signaling to set the transmission mode of all connected UEs to the antenna sending mode applied before the number of antennas is reduced, for example, transmit diversity mode or spatial multiplexing mode.
  • the base station uses the original antenna sending mode to send data.
  • an energy-saving base station is provided in an embodiment of the present invention. As shown in FIG. 2 , the energy-saving base station includes:
  • the energy-saving flag setting unit 61 may include a first setting module 611, configured to set an RS energy-saving indication as the energy-saving flag; and, accordingly, the sending unit 63 may include a first sending module 631, configured to use the whole downlink bandwidth dynamically to send data, and send RSs only in the downlink bandwidth with data to be sent.
  • the energy-saving flag setting unit 61 may include a second setting module 612, configured to set a data transmission bandwidth indication as the energy-saving flag; and, accordingly, the sending unit 63 may include a second sending module 632, configured to use the bandwidth indicated by the data transmission bandwidth indication to send data, and send RSs only in the bandwidth indicated by the data transmission bandwidth indication or only in the union set of the bandwidths indicated by the data transmission bandwidth indication.
  • the energy-saving flag setting unit 61 may include a third setting module 613, configured to set an indication of reducing antennas for sending data as the energy-saving flag; and, accordingly, the sending unit 63 may include a third sending module 633, configured to use the antenna sending mode corresponding to the reduced number of antennas to send data.
  • the energy-saving flag setting unit 61 sets the energy-saving flag when the base station intends to enter the energy-saving mode, and the energy-saving mode notifying unit 62 notifies the corresponding energy-saving mode to the UE; and then the sending unit 63 sends signals in the energy-saving mode after the energy-saving flag is set.
  • the base station can take multiple energy-saving measures under support of the UE. For example, the base station sends RSs only in the downlink bandwidth with data to be sent, or sends RSs only in the bandwidth indicated by a data transmission bandwidth indication, or sends data by using an antenna sending mode corresponding to the reduced number of antennas.
  • the base station can change the bandwidth of transmitting downlink RSs of the cell dynamically to reduce the energy consumption of the base station without changing the cell bandwidth which is a critical parameter; and the base station relieves impact on the service caused by power consumption reduction but adds no complexity to the UE.
  • the program may be stored in a computer-readable storage medium.
  • the storage medium may be a magnetic disk, a Compact Disk Read-Only Memory (CD-ROM), a Read-Only Memory (ROM) or a Random Access Memory (RAM).
  • All functional units in the embodiments of the present invention may be integrated into a processing module, or may exist physically as separate units, or two or more of such units may be integrated into one module.
  • the integrated module may be accomplished through hardware, or through software functional modules. If the integrated module is accomplished through the software functional modules and is sold or used as an independent product, the integrated module may also be stored in a computer-readable storage medium.
  • the storage medium may be a ROM, a magnetic disk, or a CD-ROM.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP13180617.6A 2010-01-08 2011-01-06 Procédé d'émission de signaux pour station de base et station de base à économie d'énergie Active EP2665314B1 (fr)

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Application Number Priority Date Filing Date Title
CN2010100022197A CN101778459B (zh) 2010-01-08 2010-01-08 一种基站发送信号方法和节能基站
EP11731677.8A EP2523508B1 (fr) 2010-01-08 2011-01-06 Procédé d'émission de signaux pour station de base et station de base à économie d'énergie

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US (1) US20120275335A1 (fr)
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EP2523508B1 (fr) 2013-08-28
US20120275335A1 (en) 2012-11-01
EP2523508A1 (fr) 2012-11-14
EP2523508A4 (fr) 2012-11-28
CN101778459B (zh) 2012-06-27
EP2665314B1 (fr) 2014-10-22
WO2011082676A1 (fr) 2011-07-14
CN101778459A (zh) 2010-07-14

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